Shock and Vibration Attenuating Device for Sports Equipment

ABSTRACT

A shock and vibration attenuating device is inserted into or attached to the stroke portion of sports equipment and provided with a chamber carrier and mass particles dispersed in one or more chambers formed into the chamber carrier. The inner surface of the chambers and the mass particles are coated with an electrically conductive material layer to prevent the particles from clinging together or clinging to the inner surface of the chambers, so that the particles are able to move freely within the chambers to attenuate the shock and vibrations of the sports equipment caused by reacting-force during stroke.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a shock and vibration attenuatingdevice for sports equipment, and more particularly to a shock andvibration attenuating device to be inserted in the sports equipmentwhich have a handle and a stroke portion.

2. Description of the Prior Art

When a force is applied to make two objects collide with each other, itwill produce two reacting forces on the two objects. Therefore, for ballgames such as tennis, badminton, baseball, golf, cricket and polo oreven skiing etc, the ball hitting or the skiing action shall beperformed by a player by hitting the ball or the ground with one handholding the sports equipment (the equipment may be the bats, clubs,rackets or ski poles etc.). When the sports equipment collides the ball,there will be a reacting force conveying to sports equipment and causesa high energetic shock impulse and vibration. The high energetic shockimpulse and the vibration would be transmitted to the hand holding thesports equipment via the handle of the sports equipment, and this is thecause of the “tennis elbow” and similar injuries.

For this reason, manufacturers of related sports equipment have beensearching for constructional possibilities to attenuate the vibrationand absorb the shock generated by kick-back by rackets. As shown inFIGS. 1 and 2A, a conventional tennis racket 10 is provided with aplurality of chambers 11 with the opening closed by a removable stopper12 and filled with movable masses, such as mass particles 13 or liquid(not shown) of high specific weight. During a striking action, the massparticles 13 or liquid will move freely within the chambers 11 alongwith the movement of the tennis racket 10 to generate a counter forceinterfering with the reacting-force caused shock impulse and oscillationwaves, so that the shock impulse and oscillation waves caused byreacting force would be attenuated before being transmitted to theplayer's hand, which therefore effectively reduces injuries to theplayer's wrist.

However, the attenuation of the high energetic impact shock impulse inprevious mass system is limited. To match the contact time of differentimpact systems, the single chambers (10) should be filled partially toallow for a free movement of either the filled-in mass particles or aheavy liquid. The heavier the specific weight of the mass particles orthe liquid is; the better the efficiency of the generated impact counterforce will be during impact. When liquid or mass particles are movingwithin the chambers during impact, the electro static phenomenon on thesurface of chambers usually results in the difficulty of movement ormalfunction of mass particles. Hence, shock impulse suppression and thevibration attenuation effect would be affected by the said difficulty ormalfunction.

The problem of electro static charges are illustrated in FIGS. 2A-2D andFIGS. 3A-3D. FIGS. 2A and 3A show that the mass particles 13 aregathered at the right side of the chamber 11 when the tennis racket 10is swung in the direction indicated by the arrow 1, and further at theinitial stage when the ball 2 just contacts with the tennis racket 10.FIGS. 2B and 3B indicate that the mass particles 13 start moving fromthe right side to the left side of the chamber 11 during impact when theball 2 collides with the tennis racket 10 and slightly deforms. Tofinally have a secondary time delayed impact, generating the counterdirected impact impulse to suppress the initially generated impact shockimpulse within the impact system is desired.

FIGS. 2C and 3C further illustrate the midpoint between the time whenthe ball 2 touches and rebounds from the tennis racket 10. Thedeformation of the ball 2 in FIGS. 2C and 3C is more apparent ascompared with the balls as shown in FIG. 3B, and the mass particles 13move to the left side of the chamber 11. FIGS. 2D and 3D show the timepoint when the ball 2 rebounds from the tennis racket 10, wherein thevibration caused by reacting force after-collision will be transferredto the mass particles 13 via the wall of the chamber 11, causing themass particles 13 to move from the left side to the right side of thechamber 11. In this way, the mass particles 13 move back and forthfreely in the chamber 11 to absorb shocks of the reacting force andattenuate oscillation. When mass particles move freely within thechambers, electro static charges are generated between the massparticles 13 or between the mass particles 13 and the inner surface ofthe chamber 11. For this reason, a quantity of mass particles 13 areclinging to the inner surface of the chamber 11 due to electro staticcharges every time when the mass particles 13 move within the chamber 11(as shown in FIGS. 2A-2D). Furthermore, only a small amount of massparticles 13 will be actively involved in the secondary impact processbecause of the static electricity and the clinging effect, in turneliminating the efficiency of the secondary impact. In comparison with adynamic system with all of the particles moving freely at all, the shockimpulse and the vibration of the tennis racket 10 in prior art cannotnot be fully attenuated. As such, the present invention has arisen tomitigate and/or obviate the afore-described disadvantages.

SUMMARY OF THE INVENTION

The primary objective of the present invention is to provide a vibrationattenuating device for sports equipment, which is capable of effectivelyabsorbing shock and reducing the vibrations of the sports equipmentdynamically during the hitting action.

To achieve the above objective, a shock and vibration attenuating devicefor sports equipment in accordance with the present invention isinserted into a stroke portion or the handle of the sports equipment.The present application introduces a device comprising a chamber carrierwhich is provided with two lateral edges, and a plurality of holesbetween the two lateral edges for better fixation within a composite- orother structure. One or more chambers are alternatively arranged withrespect to the holes and located along the two lateral edges in aprotruding manner. And the inner surface of each of the chambers iscoated with a layer of electrically conductive material. Moreover, eachof the chambers is filled with coated mass particles in such a mannerthat there is a distance left between mass particles and the innersurface of the chambers, allowing the mass particles to move freelywithin the chambers to produce efficient dynamic energy to absorbimpacts caused by a hitting action and attenuate shock caused by theimpact with the ball.

Preferably, the shock and vibration attenuating device is inserted intothe frame of a tennis racket, with the electrically conductive layerscoated on the inner surface of the respective chambers and the massparticles inside the chambers are anti-static based on electricallyconductive materials, such as Graphite or other conductive substances.

The distance for the mass particles to travel within the chambers duringthe hitting action is calculated based on the following equation 1:

${\Delta \; d\; m} = {\frac{t_{c}}{\sqrt{\Delta \; V_{m\;}}}*{COR}}$

Wherein Δdm represents the travel distance (mm) of the mass particles,t_(c) is the Contacting or Dwelling time (millisecond), ΔV_(m) is thevelocity difference of the sport equipment during the striking action,and COR is the primary impact systems coefficient of restitution. Thevelocity difference ΔV_(m) of the tennis racket during the strikingaction can be calculated based on the following equation 2:

${\Delta \; V_{m}} = \frac{2*m_{b}*V_{r}}{m_{b} + m_{r}}$

Wherein m_(b) is grams of the ball mass, m_(r) is the mass of the tennisracket (the sports equipment), and V_(r) is the velocity (m/s) of thetennis racket (the sports equipment).

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of conventional sports equipment installedwith chambers;

FIG. 2A is a cross sectional view of a conventional vibrationattenuating device showing the status of the mass particles when thesports equipment moves toward the ball;

FIG. 2B is a cross sectional view of a conventional vibrationattenuating device showing the status of the mass particles when thesports equipment collides the ball;

FIG. 2C is a cross sectional view of a conventional vibrationattenuating device showing the status of the mass particles when theball deforms upon contacting with the racket;

FIG. 2D is a cross sectional view of a conventional vibrationattenuating device showing the status of the mass particles after thesports equipment collides the ball;

FIG. 3A illustrates the time point when the ball initially contacts witha tennis racket and rebounds in accordance with the present invention;

FIG. 3B illustrates the position when the ball fully contacts with atennis racket and deforms in accordance with the present invention;

FIG. 3C illustrates position in the process from the timing when theball contacts with a tennis racket to the timing when it rebounds inaccordance with the present invention;

FIG. 3D illustrates position when the ball starts rebounding inaccordance with the present invention;

FIG. 4 illustrates the shock and vibration attenuating device for sportsequipment in accordance with a preferred embodiment of the presentinvention;

FIG. 5 is perspective view of the shock and vibration attenuating devicefor sports equipment in accordance with the present invention;

FIG. 6 illustrates that the chambers of the shock and vibrationattenuating device for sports equipment in accordance with the presentinvention are semispherical in cross section;

FIG. 7 is a cross sectional view of the semispherical chambers of theshock and vibration attenuating device in accordance with the presentinvention;

FIG. 8 is illustrative view of no clinging between mass particles andwalls of chambers in the shock and vibration attenuating device forsports equipment in accordance with the present invention;

FIG. 9 is an enlarged cross sectional view showing the chambers and massparticles of the shock and vibration attenuating device for sportsequipment in accordance with the present invention;

FIG. 10 illustrates that the chambers of the shock and vibrationattenuating device for sports equipment in accordance with the presentinvention are semicircular in cross section;

FIG. 11 is a cross sectional view of the semicircular chambers of theshock and vibration attenuating device in accordance with the presentinvention;

FIG. 12 is a diagram comparing the energy of a conventional tennisracket without chambers and invention in present application;

FIG. 13 is a diagram comparing the energy of a conventional golf clubwithout chambers and invention in present application.

FIG. 14A is the values of Sweetspot scan by tennis robot for aconventional tennis racket with chamber without being coated by a layerof electrically conductive material.

FIG. 14B is a diagram of Sweetspot scan by tennis robot for aconventional tennis racket with chambers without being coated by a layerof electrically conductive material.

FIG. 15A is the values of Sweetspot scan by tennis robot for a tennisracket with chamber being coated by a layer of electrically conductivematerial in present application.

FIG. 15B is a diagram of Sweetspot scan by tennis robot for a tennisracket containing chambers being coated with a layer of electricallyconductive material in present application.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The present invention will be understood from the following descriptionwhen viewed in accordance with the accompanying drawings, which show,for purpose of illustrations only, the preferred embodiment inaccordance with the present invention.

Referring to FIGS. 4, 5 and 6-11, a shock and vibration attenuatingdevice for sports equipment in accordance with a preferred embodiment ofthe present invention is being inserted in a stroke portion of thesports equipment which is to be hold by a player to strike an object.The sports equipment can be a tennis racket, badminton racket or a golfclub. However, the use of the shock and vibration attenuating device ofthe present invention is not limited to the sports equipment for ballgames and is applicable to any sports equipment as along as the sportsequipment is hold by a player to strike the objects and shock is causedand transferred to the player's hand during the stroke. For example, thesports equipment can be ski which start to vibrate during driving over arough ice- or snow surface and loosing contact to the ground. The shockand vibration attenuating device is used to absorb the stroke energy andattenuate the stroke shock as well as oscillation caused after thestroke energy acts on the player's hands, or like in the example,providing for the ski contact to the ground. FIG. 4 illustrates theinvention based on sports equipment 100 which is a tennis racket. Thesports equipment 100 comprises a racket frame 101 connected to a handle102, and a string bed 103 is provided along the inner periphery of theracket frame 101. The racket frame 101 is further provided with aplurality of holes 104.

Referring to FIGS. 5-7, the shock and vibration attenuating device inaccordance with the present invention is inserted in the racket frame101 of the sports equipment 100. and the shock and vibration attenuatingdevice comprises a chamber carrier 20. The chamber carrier 20 is furtherprovided with two lateral edges 201, and a first surface 21 and a secondsurface 22 which are opposite to each other and connected to the twolateral edges 201. Between the two lateral edges 201 is formed aplurality of holes 23. One or more chambers 30 are arranged along theracket frame with respect to the holes 23 in a protruding manner. Theinner surface of each of the chambers 30 is coated with a layer ofelectrically conductive material 31, and in each of the chambers 30 isprovided a number of mass particles 41. Each of the mass particles 41 iscoated with a layer of electrically conductive material 42. The massparticles 41 can be made of tungsten or tungsten alloy or otherenvironmental-friendly materials free of lead and iron, as shown inFIGS. 7, 8 and 9. However, the material of the mass particles 41 is notlimited to the abovementioned metals. Any substances with heavy weightcan be used as mass particles. After each of the chambers 30 is partlyfilled with the mass particles 41, there is a distance D left betweenthe mass particles 41 and the inner surface of the chamber 30, allowingthe mass particles 41 to move freely within the chambers 30 during astroke. The distance D is calculated based on equations (1) and (2) ofthe present invention, and the configurations of the sports equipmentand the ball. The calculation and the equations will be discussed indetail as below.

As mentioned earlier, the shock and vibration attenuating device of thepresent invention is applicable to any sports equipment with strokeportion to strike objects such as ball. For explanation of the presentinvention, the description of the present invention is based on anembodiment in which the sports equipment 100 is a tennis racket.Referring to FIG. 5, the chamber carrier 20 is inserted in the racketframe 101 of the sports equipment 100 in such a manner that the firstand second surfaces 21, 22 are perpendicular to the racket surface 103of the sports equipment 100, and the holes 23 of the chamber carrier 20are aligned and connected through the holes 104 of the racket frame 101of the sports equipment 100. The strings of the racket surface 103 areset through the holes 23 of the chamber carrier 20 and the holes 104 ofthe racket frame 101, forming the racket head for stroke.

Referring to FIGS. 8 and 9, in this embodiment, the layers ofelectrically conductive materials 31 and 42 are coated on the innersurface of the respective chambers 30 and the mass particles 41. Thelayer of electrically conductive maters can be graphite (preferablynanometer graphite particles) but not limited to graphite. The layer ofconductive material can also be nano particles of quartz, lime, marble,or powders or liquids formed by anti-static substances. By takingadvantage of the layer of electrically conductive materials, the problemthat the frictions and static electricity generated between the massparticles 41 or between the particles 41 and the inner surface of thechambers can be avoided, which then enhances releasing the energy offreely movable mass particles. After coating as shown in FIG. 10, themass particles 41 are deposited at the lower portion of the respectivechambers 30 because of gravity or typically during play by acceleration.This eliminates the problem that the mass particles 41 are adhered tothe inner surface of the chambers 30 due to static electricity. As such,the mass particles 41 are able to move freely within the chambers 30 andrelease more kinetic energy during use.

FIGS. 6, 7, 10 and 11 show another embodiment of the shock and vibrationattenuating device in accordance with the present invention. Accordingto this embodiment, one or more chambers 30 are arranged in one or moresymmetrical rows along with the two lateral edges 201 of the chambercarrier 20, and around each of the holes 23 of the chamber carrier 20are provided with four chambers 30, so that the shock and vibrationcaused by impact when the ball touches the sports equipment 100 would bereduced evenly. The chambers 30 can also be arranged in a single row oralternatively disposed with respect to the holes 23 of the chambercarrier 20 or in other shape based on the shaft or stroke portion of thesport equipment. The chambers 30 can be spherical or semispherical (asshown in FIGS. 6 and 7) or semicircular (as shown in FIGS. 10 and 11).

It is to be noted that the distance D that the mass particles 41 movewithin the chambers 30 during the striking action is calculated based onthe following equation 1:

${\Delta \; d\; m} = {\frac{t_{c}}{\sqrt{\Delta \; V_{m\;}}}*{COR}}$

Wherein Δdm represents the travel distance (mm) of the mass particles,t_(c) is the contact or dwell time (millisecond), ΔV_(m) is the velocitydifference of the sport equipment during striking action, and COR is theprimary impact systems coefficient of restitution. The velocitydifference ΔV_(m) of the sports equipment 100 during the striking actioncan be calculated based on the following equation 2:

${\Delta \; V_{m}} = \frac{2*m_{b}*V_{r}}{m_{b} + m_{r}}$

Wherein m_(b) is the mass (g) of the ball, m_(r) is the mass of thetennis racket (the sports equipment), and V_(r) is the velocity (m/s) ofthe tennis racket (the sports equipment).

The following is the comparison charts for the sports equipment with andwithout installing the present application. Embodiment 1 is test resultsof the shock and vibration attenuating device for sports equipment whichis a tennis racket.

Please refer to FIGS. 3A-3D and 12, FIG. 12 is a graph illustrating thetest results of a striking action of tennis rackets with and without thepresent application, wherein ordinate and abscissa of FIG. 12 arepressure sensor voltage and the time of impact when ball contacts withthe sports equipment (ms). The curves L1 and L2 represent the testresults of the tennis racket which is provided with the shock andvibration attenuating device based on the present invention, whilecurves L3 and L4 represent the test results of a tennis racket withoutthe shock and vibration attenuating device based on the presentinvention. FIG. 12 indicates different vertical lines A, B, C, D and E,wherein the vertical lines A and E represent start and end of dwellingtime during impact when ball 2 touches on the sports equipment as shownin FIG. 3A. During the time between the vertical lines A and B, the ball2 contacts with the sports equipment and slightly deforms as shown inFIG. 3B. The vertical line B represents the time point that Ball flatmaximum is formed when the ball 2 contacts with the sports equipment asshown in FIG. 3C. Furthermore, the vertical line C represents the halfof dwell time after the ball 2 hits on the tennis racket 10. Finally,the vertical line D represents the time point when the ball 2 startsrebounding from the sports equipment affected by the maximum reboundingforce as shown in FIG. 3D. At this time point, the ball 2 still stays onthe sports equipment and slightly deforms.

It is to be noticed that the curve L1 of the sports equipment providedwith the shock and vibration attenuating device based on the presentinvention is less steep than the curve L3. And the amplitude of thecurve L2 is much smaller than that of the curve L4, which means that theshock and vibration attenuating device of the present invention isdramatically capable of absorbing the stroke impact and attenuating thevibration caused by the stroke impact, hence reducing injuries of theplayer's hands.

Embodiment 2 is the test results of the shock and vibration attenuatingdevice for sports equipment which is a golf club.

FIG. 13 is a graph illustrating the test results of a striking actionwhich is conducted by striking a golf ball with the golf club, whereinthe ordinate and abscissa of FIG. 13 are voltage and the time of impactwhen ball contacts with the sports equipment (ms). The curve L5represents the test results of the golf club which is provided with theshock and vibration attenuating device based on the present invention.Moreover, the curve L6 represents that the voltage values are changed byusing the pressure of impact when the ball hitting on the sportsequipment. The curve L6 is used to detect the start point (the verticalline O in the drawing) and end point (the vertical line X) of the curveL5 during the impact.

As indicated by the curve L5, the vibration wave after stroke is lesssteep than the vibration wave during stroke for the golf club providedwith the shock and vibration attenuating device. This proves that thegolf club which is installed with the shock and vibration attenuatingdevice of the present application is capable of releasing kinetic energyto absorb the stroke shock and attenuate the vibration caused by stroke.

Embodiment 3 are test results of a tennis racket provided with aconventional vibration attenuating device and a tennis racket with ashock and vibration attenuating device of the present invention.

FIGS. 14 and 15 are sweetspot scan polar diagrams with data acquired bytennis robot and further calculated by formulas. The test results of atennis racket containing mass particles without being coated withconductive layer are different from and that of a tennis racket withmass particles 41 being coated with the conductive layer 42.

At the top left of FIGS. 14 and 15 are preset border values, wherein theborder value for power zone is 25%, Dynamic Precision border value is35%, Dynamic Shock absorption boarder value is 35%, D-COR boost bordervalue is 38%, and the strung area is 109 in².

The lower left of FIGS. 14 and 15 shows the values obtained in the testsperformed under the above conditions, and the right sides FIGS. 14 and15 are corresponding polar diagrams. The Dynamic Precision Zone (Dyn.Precision Zone) is the part of the tennis racket which can impart arelatively larger force to the ball when striking, and the ball can bedirected to a desired position additionally. When the tennis racket isswung within this area, the player can control the direction of the ballmore precisely. The ball can be played with reasonably higher efficiencyand less effort from the player to reach the same ball velocity.Therefore, and the shock and the vibration caused by the striking actioncan effectively be reduced if the ball impacts the Dynamic PrecisionZone. As a result, the larger the Dynamic Precision Zone is, the morelikely it increases the precision of the ball direction and reducessports injuries caused by lateral torque of the racket.

As shown in FIG. 14A, when using the tennis racket which is providedwith mass particles without being coated with an electrically conductivelayer, the tested Dynamic Precision Zone is 9.83 in², which correspondsto the area defined by the symbol “□”. FIG. 15A shows that the testedDynamic Precision Zone of a tennis racket which is provided with massparticles coated with an electrically conductive layer is 18.26 in²,which is almost twice than that of the conventional tennis racket inFIG. 14A. Besides, the area defined by the symbol “□” shown at the rightside of FIG. 15B is obviously larger than that of FIG. 14B. It isobvious that the tennis racket of the present invention installed withmass particles coated with the electrically conductive layer provideslarger Dynamic Precision Zone, as such is more capable of reducing shockand vibration to diminish the sports injuries, such as “tennis elbow”.

The value of Shock abs. Zone (Shock Absorption Zone) shown at the lowerleft of the drawings indicates the capability of absorbing shocks causedby the striking action when swinging tennis. Hence, the shock can besubstantially absorbed if the value of Shock abs. zone is higher, thusreducing the hurts to the player. FIG. 14A shows that the Shock abs.Zone of the conventional tennis racket containing mass particles withoutcoating of conductive layer is 5.62 in². In contrast, FIG. 15A showsthat the Shock abs. Zone of the tennis racket of the present inventionis 10.65 in², which is almost twice than that of the conventional tennisracket. The area of Shock Absorption is defined by the symbol “⋄” shownat the right side of FIG. 15B and this zone is obviously larger thanthat in FIG. 14B. This proves that the shock-absorption area can beincreased for the tennis racket installed with mass particles beingcoated with electrically conductive layer of the present invention. Theincrease of the Dynamic Precision Zone and Dynamic Shock absorption zoneboth prove the present invention provides higher effect of attenuatingthe reacting-force caused shocks and vibrations of the sports equipment.

In general, the electrically conductive layer coated on the innersurface of the respective chambers 30 and the mass particles 41 preventsthe mass particles 41 from clinging together or clinging to the innersurface of the chambers 30, so that the kinetic energy of the presentinvention is increased 60% as compared to the conventional structure.Besides, the preferable amounts of chambers and the movement distance Dof mass particles can be calculated based on the above equations 1 and2. The amounts of chambers, the configuration of the chambers 30 andmovement distance of mass particles can be adjusted to optimize theeffect of attenuating shocks according to the type of sports equipment.Therefore, the chambers can be installed as many in relation to thevolume of the stroke portion or the shaft.

What is claimed is:
 1. A shock and vibration attenuating device forsports equipment being inserted into or attached to a stroke portion ofthe sports equipment comprising: A chamber carrier with two lateraledges, a plurality of holes between the two lateral edges; a singlechamber or one or more rows of chambers alternatively arranged withrespect to the holes and located along the two lateral edges in aprotruding manner, an inner surface of each of the chambers being coatedwith a layer of electrically conductive material; and a single or aplurality of mass particles, each of the chambers being partially filledwith the mass particles, each of the mass particles being coated with alayer of electrically conductive material, each of the chambers beingfilled with one or more of the mass particles in such a manner thatthere is a distance between the electrically conductive mass particlesand the inner surface of the chambers, allowing the mass particles tomove freely within the chambers to dynamically suppress impact shockduring the striking action and dynamically reduce vibration after theimpact.
 2. The shock and vibration attenuating device for sportsequipment as claimed in claim 1, wherein the electrically conductivelayer on the inner surface of the respective chambers and the massparticles are coated by electrically conductive materials, such asgraphite, metal sputtering or galvanic coating processes.
 3. The shockand vibration attenuating device for sports equipment as claimed inclaim 1, wherein the travel distance of the mass particles moving withinthe chambers during the striking action, is calculated based on thefollowing equation 1:${\Delta \; d\; m} - {\frac{t_{c}}{\sqrt{\Delta \; V_{m\;}}}*{COR}}$Wherein Δdm represents the travel distance that the mass particlesmoves, t_(c) is the dwelling time, ΔV_(m) is the velocity difference ofthe sports equipment during the striking action, and COR as the primaryimpact systems coefficient of restitution.
 4. The shock and vibrationattenuating device for sports equipment as claimed in claim 3, whereinthe velocity difference ΔV_(m) of the sports equipment during thestriking action is calculated based on the following equation 2:${\Delta \; V_{m}} = \frac{2*m_{b}*V_{r}}{m_{b} + m_{r}}$ whereinm_(b) is the mass of the ball, m_(r) is the mass of the sportsequipment, and V_(r) is the velocity of the sports equipment.
 5. Theshock and vibration attenuating device for sports equipment as claimedin claim 1, wherein the sports equipment is a tennis racket, golf club,or bat.
 6. The shock and vibration attenuating device for sportsequipment as claimed in claim 1, wherein the sports equipment is a ski.7. The shock and vibration attenuating device for sports equipment asclaimed in claim 1, wherein the sports equipment comprises a frameconnected to a handle when the sports equipment is a tennis racket, anda string bed provided around an inner periphery of the frame, the racketframe is further provided with a plurality of holes, the chamber carriercomprises a first surface and a second surface which are opposite toeach other and connected to the two lateral edges, the chambers areformed on the first surface of the chamber carrier in a protrudingmanner, the chamber carrier is inserted into the frame of the sportsequipment in such a manner that the first and second surfaces areperpendicular to the string bed of the sports equipment, and the holesof the chamber carrier are aligned and connected through the holes ofthe frame of the sports equipment.
 8. The shock and vibrationattenuating device for sports equipment as claimed in claim 1, whereinthe chambers are arranged in two symmetrical rows along the two lateraledges of the chamber carrier, and around each of the holes of thechamber carrier are arranged four said chambers.
 9. The shock andvibration attenuating device for the sports equipment as claimed inclaim 1, wherein the chambers are semispherical in cross section. 10.The shock and vibration attenuating device for the sports equipment asclaimed in claim 1, wherein the chambers are semicircular, spherical orhalf spherical in cross section.
 11. A shock and vibration attenuatingdevice for sports equipment being inserted into a stroke portion of thesports equipment comprising: a chamber carrier with two lateral edges, aplurality of chambers arranged along the two lateral edges, and in eachof the chambers being disposed one or more mass particles; and the shockand vibration attenuation device being characterized in that: an innersurface of each of the chambers is coated with a layer of electricallyconductive materials, each of the chambers are provided with one or moremass particles, each of the mass particles is coated with a layer ofelectrically conductive materials, there is a distance between the massparticles and the inner surface of the chambers, allowing the massparticles to move freely within the chambers to absorb stroke impactcaused by a striking action and reduce shocks caused by the strokeimpact.
 12. The shock and vibration attenuating device for the sportsequipment as claimed in claim 11, wherein the travel distance that themass particles moves within the chambers during the striking action arematched to the respective impact system which is calculated based on thefollowing equation 1:${\Delta \; d\; m} = {\frac{t_{c}}{\sqrt{\Delta \; V_{m\;}}}*{COR}}$wherein Δdm represents the travel distance D that the mass particlesmoves, t_(c) is the dwelling time, ΔV_(m) is the velocity difference ofthe sports equipment during the striking action, and COR is primaryimpact systems coefficient of restitution.
 13. The shock and vibrationattenuating device for sports equipment as claimed in claim 12, whereinthe velocity difference ΔV_(m) of the sports equipment during thestriking action is calculated based on the following equation 2:${\Delta \; V_{m}} = \frac{2*m_{b}*V_{r}}{m_{b} + m_{r}}$ whereinm_(b) is the mass of the ball, m_(r) is the mass of the sportsequipment, and V_(r) is the velocity of the sports equipment.
 14. Ashock and vibration attenuating device for sports equipment beinginserted into a frame or attached alongside the frame of a tennis racketcomprising: a chamber carrier with two lateral edges, a plurality ofholes between the two lateral edges; one or more chambers alternativelyarranged with respect to the holes and located along the two lateraledges in a protruding manner, an inner surface of each of the chambersbeing coated with a layer of electrically conductive materials; and oneor more mass particles, each of the mass particles being coated with alayer of electrically conductive materials, each of the chambers beingfilled with one or more mass particles in such a manner that there is adistance between the mass particles and the inner surface of thechambers, allowing the mass particles to move freely within the chambersto absorb stroke impact caused by a striking action and reduces shockscaused by the stroke impact.
 15. The shock and vibration attenuatingdevice for the sports equipment as claimed in claim 14, wherein thetennis racket comprises a frame connected to a handle, and a string bedprovided around an inner periphery of the frame, the frame is furtherprovided with a plurality of holes, the chamber carrier is provided witha first surface and a second surface which are opposite to each otherand connected to the two lateral edges, the one or more chambers areformed on the first surface of the chamber carrier in a protrudingmanner, the chamber carrier is inserted into the frame of the tennisracket in such a manner that the first and second surfaces areperpendicular to the string bed of the tennis racket, and the holes ofthe chamber carrier are aligned and connected through the holes of theframe of the tennis racket.